FYI, this free webhosting site give you $5 for each active referrals.
So, this is a good opportunity for those who want to earn from free hosting
I think they pay only when any of our referral upgrade for costly paid web hosting. That's also I'm not sure because I've read 000webhosting affiliate program is a scam in hostbidder.com. They don't pay us.

But they are famous for free web hosting, and their hosting is reliable, it can be used to practice on. I don't know about paid one.